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If the vectors veca=2hati-hatj+hatk, vec...

If the vectors `veca=2hati-hatj+hatk, vecb=hati+2hatj-hat(3k) and vecc= 3hati+lamda hatj+5hatk` are coplanar the value of `lamda` is (A) -1 (B) 3 (C) -4 (D) `-1/4`

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